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1. First make sure you have Java installed
2. If you’re using a new version of java (Above Version 6 update 12) then downgrade your version.
3. Make sure your using Internet Explorer/Firefox or Mozilla.
4. Make sure you are NOT trying to access the ADSM through a proxy server.
5. Can another PC access the ADSM?
6. If the ADSM Opens but will not launch properly > File > Clear ASDM Cache > Clear internal Log Buffer > Refresh Running Configuration with

Before you proceed make sure that the ASDM has been enabled.

1. Connect to the firewall either by SSH/Telnet/Console Cable.
2. Issue an "enable" command and enter the enable password.
3. Issue a show run command and make sure that you see the following in the running configuration on the device.

Http server enable

Note If you see "no http server enable" then its disabled and you need to go to "Configure Terminal" mode and issue a "http server enable" command.
Note If you see "http server enable {a number}" then it has been set up on a different port number and needs to be accesses via https://ip address:{a

number}

4. Providing the server is enabled you need to ensure that you have been granted access to it you can grant access to a network or an individual host.
5. Ensure the IP address you are trying to open the ASDM from is included in the config, i.e.